From bcfeacab45e6d419c6bafc0e57ea4b1125e23231 Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo@redhat.com>
Date: Tue, 16 Jun 2015 18:33:35 +0200
Subject: [PATCH] vhost: use binary search instead of linear in find_region()

For default region layouts performance stays the same
as linear search i.e. it takes around 210ns average for
translate_desc() that inlines find_region().

But it scales better with larger amount of regions,
235ns BS vs 300ns LS with 55 memory regions
and it will be about the same values when allowed number
of slots is increased to 509 like it has been done in kvm.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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